Thanks Matt, I can't trigger multiple MP modals without about:logins, as you also noticed. Marking this as verified - fixed on latest Beta71.0b6 and Nightly on Windows 10 x64, MacOS 10.13 and Ubuntu 18.04. Will log the above scenarios as new bug in about:logins.
Bug 1587927 Comment 22 Edit History
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Thanks Matt, I can't trigger multiple MP modals without about:logins, as you also noticed. Marking this as verified - fixed on latest Beta71.0b6 and Nightly on Windows 10 x64, MacOS 10.13 and Ubuntu 18.04. Will log the above scenarios as new bug in about:logins. (edit: that would be Bug 1593983)